The saddest email in web work: “we launched the beautiful new site and our Google traffic collapsed.” The design didn’t fail — the URLs changed and nobody forwarded the mail. Redirects are the unglamorous deliverable that separates redesigns from ranking resets.
Why old URLs are assets
Every old URL holds accumulated trust: links from other sites, Google’s history, customers’ bookmarks. Change /services.html to /services/ without a 301 redirect and that trust doesn’t transfer — it dies at a 404, and rankings restart from zero.
The redirect map
Before launch: a list of every old URL and its new home — one-to-one where possible, to the closest relevant page otherwise (never everything-to-homepage, which Google treats as soft 404s). After launch: crawl the old URLs and watch Search Console’s 404 report for stragglers.
The ten-minute self-check
Google site:yourdomain.com, click your own old results — every 404 you land on is bleeding authority right now. It’s a launch-week checklist item in every rebuild we do; redesigning with someone? Ask to see the redirect map — its existence predicts your traffic curve.
Frequently Asked Questions
URLs changed without 301 redirects — accumulated trust died at 404s instead of transferring.
A pre-launch list pairing every old URL with its new home — the redesign's most valuable spreadsheet.
No — Google treats mass homepage redirects as soft 404s; map to the closest relevant page.
Effectively forever — old links and bookmarks live for years; redirects are permanent infrastructure.
Search site:yourdomain.com and click old results; Search Console's 404 report catches the rest.
Modern 301s pass essentially full signal — losing rankings comes from not having them.
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